Which of the following statements is true of the photosynthetic structures in bryophytes?
A. Thalloid and leafy species are found in all
groups of bryophytes.
B. A thallus is a thin stem that supports the
leaves of bryophytes.
C. Bryophytes have true leaves similar to
those found in gymnosperms.
D. All hornworts have leaf-like photosynthetic
structures.
E. All mosses have leaf-like photosynthetic
structures.
E
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A bacterial genus that is found in large numbers in the intestinal tract of breast-fed infants is
A. Escherichia. B. Bifidobacteria. C. Bacteroides. D. Doderlein's bacillus.
In plant cells, chloroplasts are found ____
a. on the cell membrane b. in the cytoplasm of the cell c. in the stroma d. in the thylakoids e. in the central vacuole
In many dense forests, plants living near the ground level engage in intense competition for
A) oxygen. B) water. C) carbon dioxide. D) sunlight.
Each water molecule is joined to _____ other water molecules by ______________ bonds.
a) two ... polar covalent b) four ... hydrogen c) three ... ionic d) four ... polar covalent e) two ... hydrogen